I did this last year and will likely do it again this winter as well. For right around $100 you have space for 4 full seed trays under lamps:
1 - metal shelf from Lowes for $60 like this one:
2 - T8 light fixtures from Lowes $18 each
2 - T8 bulbs $9 5000K
2 - T8 bulbs $9 6500k
I hang them from the shelves over my seed trays. 2 trays fit lengthwise on each shelf with a little overhang. I have 1 of each bulb (warm and cool) in each lamp, and I have it on a power timer for 15hrs a day. I have the whole thing in front of a south facing sliding glass door and let the sun supplement the lamps.
I had great success last winter from the beginning of February till i planted outside in late April. I will likely do it again this year even earlier. I'll set it up this week since we're due for our first freeze and take a pic.